Process for the production of pure nitric acid.



. 15 jecting atmosphe'ric'airto the action-of elec- I I M aqueous vapor while "the "said gases have-a;

, portionin the A RY; PAULING, .OF eE SEN IROHEm- GERMANY, AssieNo j ro' rH-EFIBM ,saLrnTERsAURE NnUs rRIEeEsE LsonA T, a. 'M. B'.'* 1, 01: GELsEN -IRCH Q,

GERMANY.

rnocnss FOR 'rlm" r zo'noc'rron oF'PU'B mn1c" cm.-

Specification of Letters latent.

- ,Pat entedf-Jani 21,1 05.

, Application filed' April 6.1906. ammo. 310.299.-

5 the Province of Westphalia, in the Kingdom-v of Prussia, German Em ire, have invented certaulnew and usefu Improvements in Processes for the Production ofPure Nitric Acid, of which the following is a-specification.

This invention-relates to processes for the production-ofpure nitric acid, 1 According to my invention such nitric- I acid-is produced from 'nitrogenousgases, sucha's areobtained,.forexamplQ-by subtrical dischar esL' t T 0 such en the invention consists inIadding water oraqueous vaporto the hot -nitrogenous' gases, so as to intimately 20 them therewith while the nitrogenous gases have a temperature of 200 0., Y land in coolin down the mixture until pure nitricacid is ormed;

A further improvement consists-in so'pro-' guantity of'water or a ueous' vapor to e ad ed that the vapors 0 nitric \flCld produced thereby have atemperature at which they are stillin a- 'aseous condition-,1 that is, a temperature of about 100? C; The obj'eotthis case is, to be able to:

the nitric acidwhjle in its gaseous conass ition' into metallic pipes where it' is cooled down to a certaintemperature. It is then conducted into suitable clay ap a'ratus for 35- condensation.-" In these metallic cooling apparatus the gases-of nitric acid, are so far cooled down that the clay apparatus shall "not be affected-by anundu'e temperature of the gases received for condensation. Also.

the {hot gases ofrea'ctiom that is the'nitrog? enous 'gases resulting from the "action' 'ofthe electrical discharges on the air, mayjbe'rei- ,cei'ved' in metallic pipes and here be mixed with the I requisite quantity of water or n it It is advantageous, in connection aqueous vapor;

"this process, I to use such'air. as contains no; more than per- CflhfQf ltS volume asfnitne- OXld. t

What 1s claimed is:

in subjecting atm0spheric" 'air to the action of electrical discharges, mixing the. mt -ienous gasesthus formed,- withf'waterfor' minimum temperature ofjZ'OO? ,and cooling downthe mixture, as setflforth."

in the gases: of ni-tricacid into suitable ine-j ta lic cooling apparatus! and Lfrom -thence.

tion, as set forth.

aye-me; this 23-rd day of February .1906, the presence of two" subscribingwitnessesi:

RRY PAL' L NG Witnesses? ULYssEs J BYIWA'TER,

'GEORG KENN R.

2;. The here ndescrib d-process,"cons1 sting' in subjecting atmospheric 'airto the action .of electrical .d'i'scharges,--

the ziitrog into suitable clay apparatus for condensa-z 1 The hereindescribed' process, consist ng In wltness' whereof I have hereunto-signed 

